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Published on: January 30, 2018

[Effect of tBHQ and sulforaphane on Nrf2-ARE signaling pathway of Caco2 cells]

Xiao-yuan Wu1, Li-yan Qu, Kang Quan

  • 1Department of Biochemistry and Genetics, College of Medicine, Zhejiang University, Hangzhou, China.

Zhejiang Da Xue Xue Bao. Yi Xue Ban = Journal of Zhejiang University. Medical Sciences
|February 23, 2010
PubMed
Abstract

Insights

Tert-butylhydroquinone (tBHQ) and sulforaphane (SFN) increase Nrf2 protein accumulation and activate the Nrf2-ARE pathway in Caco2 cells. This study provides evidence for their use in cancer chemoprevention and drug development.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • The Nrf2-ARE signaling pathway plays a crucial role in cellular defense against oxidative stress and inflammation.
  • Dysregulation of Nrf2-ARE signaling is implicated in various diseases, including cancer.
  • Tert-butylhydroquinone (tBHQ) and sulforaphane (SFN) are known activators of the Nrf2 pathway.

Purpose of the Study:

  • To investigate the effects of tBHQ and SFN on protein expression within the Nrf2-ARE signaling pathway in Caco2 cells.
  • To determine the time-dependent changes in key protein levels following treatment with tBHQ and SFN.
  • To provide experimental evidence for the application of these compounds in cancer chemoprevention and therapeutic strategies.

Main Methods:

  • Human colorectal carcinoma Caco2 cells were treated with tBHQ (20 micromol/L) and SFN (5 micromol/L).
  • Real-time PCR and Western blotting were employed to quantify target gene and protein expression.
  • Immunofluorescence staining and confocal microscopy were used to visualize Nrf2 nuclear accumulation.

Main Results:

  • Both tBHQ and SFN treatment led to a time-dependent increase in Nrf2, AKR1C1, and NQO1 protein expression in Caco2 cells.
  • Nrf2 protein levels were significantly elevated at 8 hours, while AKR1C1 and NQO1 expression increased at 16 hours post-treatment.
  • Confocal microscopy confirmed that Nrf2 accumulated in the nucleus within 6-8 hours of tBHQ treatment, with sustained elevation.

Conclusions:

  • tBHQ and SFN effectively induce nuclear accumulation of Nrf2 and activate Nrf2-dependent gene expression via the ARE in Caco2 cells.
  • The findings support the potential of tBHQ and SFN in cancer chemoprevention strategies.
  • This research offers valuable data for optimizing the dosage and frequency of inducers in Nrf2-ARE pathway modulation for therapeutic purposes.

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